Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Wavelength-modulated coherence pumping and hyperfine repumping for an atomic magnetometer

Active Publication Date: 2018-01-16
RGT UNIV OF CALIFORNIA +1
View PDF46 Cites 45 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is an improved FM-NMOR magnetometer and method of magnetometry that includes a linearly-polarized pump beam generator. The invention uses a special infrared laser to measure the rotation of atomic vapors in a cell, which stables the laser's wavelength. The modulation amplitude of the laser is adjusted to a specific range to improve accuracy. The preferred embodiment uses an atomic vapor cell and a lock-in amplifier to stabilize the laser's wavelength. The invention can measure both the magnetic field and the field gradient simultaneously, providing more precise information. The technical effects of this invention are improved accuracy and efficiency in measuring magnetic fields and gradients.

Problems solved by technology

An unwanted side effect of optical pumping, particularly in coated cells, is that it also results in hyperfine pumping.
The vapor cell coatings that lead to long coherence lifetimes also result in slow relaxation of hyperfine levels.
This limits the extent to which population can build up in unpumped level.
However, the method of Belfi does not work with a magnetometer that pumps alignment with a linearly polarized laser.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wavelength-modulated coherence pumping and hyperfine repumping for an atomic magnetometer
  • Wavelength-modulated coherence pumping and hyperfine repumping for an atomic magnetometer
  • Wavelength-modulated coherence pumping and hyperfine repumping for an atomic magnetometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030]The present invention is preferably implemented using the NMOR apparatus described by U.S. Pat. No. 8,587,304, to Budker, when used in frequency modulation mode. The operation differs from that which has been previously described. The probe beam is preferably adjusted in the usual way to optimize the sensitivity. D. F. Jackson Kimball, et al., “Magnetometric sensitivity optimization for nonlinear optical rotation with frequency-modulated light: rubidium D2 line”, Journal of Applied Physics 106, 063113 (2009). In the approach by Budker this means that the probe should be detuned from the center of one of the hyperfine peaks by about one-half line width (LW), with an optical power adjusted so that line width of the NMOR resonance is not significantly broadened, or about 1 μW for a resonance width of about 10 Hz.

[0031]The modulation frequency is preferably set equal to or scanned around the region of the Larmor frequency or a sub-harmonic, not twice the Larmor frequency. However,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An FM-NMOR magnetometer and concomitant magnetometry method comprising providing a linearly-polarized pump beam generator, employing a center wavelength approximately equal to a center wavelength of hyperfine peaks, and employing a modulation amplitude in the range HFS-3×LW to HFS.

Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0001]This invention was made with government support under Contract No. N68335-10-C-0576 awarded by the U.S. Department of the Navy. The government has certain rights in the invention.CROSS-REFERENCE TO RELATED APPLICATIONS[0002]Not Applicable.INCORPORATION BY REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISC[0003]Not Applicable.COPYRIGHTED MATERIAL[0004]Not Applicable.BACKGROUND OF THE INVENTIONField of the Invention (Technical Field)[0005]The present invention relates to magnetometry, particularly atomic magnetometry in alkali vapors that are pumped with linearly polarized light. The invention provides a way to both pump an optical coherence and simultaneously provide repumping to reduce the signal loss associated with unwanted hyperfine pumping in laser-based alkali vapor magnetometers.Description of Related Art[0006]Magnetometers are used in a number of areas. These include the measurement of Earth's field to unders...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01R33/26G01R33/032
CPCG01R33/26G01R33/032
Inventor HOVDE, DAVID CHRISTIANBUDKER, DMITRYPATTON, BRIAN
Owner RGT UNIV OF CALIFORNIA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com